Fengchengite
A variety of Eudialyte group
What is Fengchengite?
Fengchengite is a rare mineral of the eudialyte group with the formula Na12[ ]3(Ca,Sr)6Fe33+Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2. The formula is simplified as it does not show the presence of cyclic silicate groups. When compared to other minerals of the group, fengchengite characterizes in the presence of ferric iron (thus similar to ikranite, mogovidite and feklichevite) and essential, site-dominating vacancies. The mineral was discovered in the Saima complex near Fengcheng city in China - hence its name.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fengchengite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Quick Facts
Physical Properties
- Color
- Rose to deep-rose
- Hardness (Mohs)
- 5
- Rock tumbling
- With care
- Density
- 2.839 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Na12◻3(Ca,Sr)6Fe3+3 Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2
- Elements
- Ca, Cl, Fe, H, Na, O, Si, Sr, Zr
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Fengchengite FAQs
How do I identify Fengchengite?
Fengchengite can be identified by its hardness of 5 on the Mohs scale, Rose to deep-rose color. Look for these key characteristics when examining specimens.
What color is Fengchengite?
Fengchengite typically appears in Rose to deep-rose. Color can vary depending on impurities and formation conditions.
How hard is Fengchengite?
Fengchengite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
